Flared main well tube



March 19, 1963 w. E. EGERER 3,

FLARED MAIN WELL TUBE Filed Feb. 27, 1961 g Y 56 I 1 22 54 I23 27 I H62.

l6 IO INVENTOR.

WILLIAM E.EGERER,DEGEA$ED IY DONALD F. EGERERJXEOUTOR ATTORNEYS United States Patent 3,081,986 FLARED MAIN WELL TUBE William E. Egerer, deceased, late of Detroit, Mich., by Donald F. Egerer, executor, Warren, Mich, assignor to Holley Carburetor Company, Warren, Mich, a corporation of Michigan Filed Feb. 27, 1961, Ser. No. 92,733 1 Claim. (Cl. 261-65) This invention relates to carburetors and refers more specifically to a fuel metering system for internal combustion engine carburetors or similar devices including a fuel well having a fuel well tube with a flared end therein whereby the fuel well tube is removably held in position within the fuel well. i

In the past fuel well tubes in fuel metering systems have been suspended within fuel wells by means of press fitting the fuel well tubes into an opening at one end of the fuel well. Such construction has the disadvantage of requiring the manufacture of the fuel well and fuel well tube to close tolerances and further does not permit removal and replacement of the fuel well tubes when desired.

It is therefore one of the objects of the present invention to provide a fuel metering system including a fuel well tube removably and replaceably suspended within a fuel well.

Another object is to provide a fuel metering system comprising a fuel well provided with an opening in one end thereof having an inner surface tapering radially axially outwardly of the fuel well, a fuel well tube suspended within the fuel well and having a flared open end in sealing engagement with the tapered opening in the fuel well and means for exerting sealing pressure on the fuel well tube.

Another object is to provide a carburetor including a main fuel well suspended in the carburetor fuel bowl chamher and having a conical opening in the upper end thereof, a main fuel well tube having a flared upper end in sealing engagement with the conical opening of the main well tube and a sealing gasket sandwiched between the flared end of the main fuel well tube and the cap of the carburetor whereby the main fuel well tube is removably and replaceably sealed in the conical opening in the upper end of the main metering system.

Another object is to provide a fuel metering system as set forth above which is simple in construction, economical to manufacture and eflicient in use.

Other objects and features of the invention will become apparent as the description proceeds, especially when taken in conjunction with the accompanying drawings, illustrating a preferred embodiment of the invention, wherein:

FIGURE 1 is an elevation view partly in cross section of a carburetor including a fuel metering system constructed in accordance with the invention.

FIGURE 2. is an enlarged partial section of the fuel metering system illustrated in FIGURE 1.

With particular reference to the figures of the drawing one embodiment of the present invention will now be disclosed.

The carburetor illustrated in FIGURE 1, includes the main fuel metering system generally designated 12 having the fuel well 14 and the fuel well tube 16. In accordance with the invention the fuel well tube 16 is removably and replaceably suspended from the end 18 of the fuel well 14 by means of a flared end 20 held in sealing relation to the conical opening 22 in the fuel well 14 by means of gasket 24 and the air horn and fuel bowl cover 26 of carburetor 10, as shown best in FIGURE 2.

More specifically the carburetor 10 comprises the throttle body and fuel bowl member 28 including a fuel ice bowl chamber 30 therein, an intermediate metering spacer 32 in which the fuel metering system 12 is formed, and the air horn and fuel bowl cover 26. The throttle valve 36 is pivotally mounted in the air intake passage 38 to the engine 40 in the usual manner. Similarly the carburetor choke 42. is mounted in the air horn and fuel bowl cover 26 of the carburetor 10. The gasket 24 provides a seal between the air horn and fuel bowl cover 26 and the metering spacer 32 of the carburetor as well as holding the flared end 20' of the fuel well tube 16 in contact with the conical seat provided therefor in the end 18 of the fuel well 14 as previously mentioned.

The main fuel metering system 12 of the carburetor 10 includes the fuel well 14 and fuel well tube 16 indicated above along with the metering jet 46 and the discharge nozzle 48. The fuel metering system further includes the main air bleed passage 50 and chamber 52 and the passages 54 and 56 which in conjunction with the chamber 58 provide a path for the fuel air mixture from the fuel well 14 to the discharge nozzle 48. A second air bleed passage 60 is provided in the discharge nozzle 48 to provide a more homogeneous air fuel mixture at the nozzle.

In operation fuel is metered into the fuel well 14 through the metering jet 46 and is mixed with air from the air bleed passage 50 through chamber 52, opening 62 in gasket 24, the interior of the fuel well tube 16 and the radially extending openings 64 therein, as shown in FIG- URE 2. A partially homogeneous fuel air mixture is then drawn from the fuel well 14 through the passage 54 into the chamber 58. Subsequently the fuel air mixture from chamber 58 is drawn through the passage 56 where it is further mixed with air through the air bleed 60 and is finally discharged as a homogeneous air fuel mixture from the discharge nozzle 48.

With such fuel metering systems it is sometimes desirable to remove the fuel well tube 16 and either repair or replace the tube. In the past the main fuel well tube has often been permanently secured in an opening in the end 18 of the fuel well tube 14 as by means of a press-fit or similar connection. Thus the repairing and replacement of the fuel well tube has previously been impossible or so diflicult as to be impractical. Therefore in accordance with the invention means for suspending the fuel well tube from the end 18 of the fuel well which permits ready removal and replacement of the fuel well tube in the fuel well in a sealed condition is provided.

As shown best in FIGURE 2 the opening 22 in the end 18 of the fuel well 14 is flared or enlarged radially axially outwardly of the fuel well to provide an inverted frustoconical sealing surface 23 and the end 20- of the fuel well tube 16 is similarly flared to provide a radially inner frusto-conical surface 25 parallel to a radially outer frusto-conical sealing surface 27 which surface 27 is in engagement with the frusto-conical surface 23 in assembly and a third frusto-conical surface 29 extending perpendicularly between the parallel surfaces 25 and 27. The gasket 24 is seated against the frusto-conical surfaces 25 and .29 of the flared end 20 of the fuel well tube 16 in accordance with the invention to provide sealing pressure between theflared surface of the opening 22 in the end 18 of the fuel Well 14 and the flared end 20 of the fuel well tube 16 when the air horn and fuel bowl cover 26 is secured to the carburetor 10', as best shown in FIGURE 2. The air horn and fuel bowl cover 26 is engaged with the gasket 24 and secured to the throttle body and fuel bowl member 23 by convenient means (not shown).

Thus in accordance with the invention the fuel well tube 16 is removably and replaceably suspended in the end 18 of the fuel well 14 by simple, economical and efficient means. To remove the replaceable fuel well tube for inspection, repair or replacement it is only necessary to remove the air horn and fuel bowl cover 26 and gasket 24 of the carburetor 10.

The drawings and the foregoing specification constitute a description of the improved fuel metering system in such full, clear, concise and exact terms as to enable any person skilled in the art to practice the invention, the scope of which is indicated by the appended claim.

What is claimed is:

A carburetor including a throttle body and fuel bowl member having a fuel bowl chamber therein, a fuel metering member including a fuel well depending therefrom which fuel metering member is positioned on the throttle body and fuel bowl member with the fuel well suspended in the fuel bowl chamber, said fuel well having an opening in one end thereof which one end is integral with the fuel metering member, a frusto-conical seating surface in said fuel metering member surrounding said opening, a fuel well tube closed at one end and having a frustoconical flared other end including a radially inner and a radially outer frusto-conical surface extending in parallel with each other, and another frusto-conical surface extending between and perpendicular to said pair of parallel surfaces the radially outer surface being frusto-conical and complementary to the frusto-conical seating surface provided around the opening in the fuel metering member, said fuel well tube being suspended within the fuel well with the complementary frusto-conical surfaces on the fuel well tube and fuel metering member engaged, a sealing gasket fitting over said fuel well tube and engaged with the radially inner of said frusto-conical surfaces and said another frusto-conical surface of the flared tube end for urging the complementary frusto-conical surfaces into engagement and sealing between the fuel well tube and fuel well on being biased toward the fuel metering memher, and an air horn and fuel bowl cover engaged with said gasket and secured to the throttle body and fuel bowl member operable to bias the sealing gasket toward the fuel metering member.

References Cited in the file of this patent UNITED STATES PATENTS 2,087,430 Cummins July 20, 1937 2,399,637 Jones May 7, 1946 2,418,011 Carlson Mar. 25, 1947 2,615,694 Olson Oct. 28, 1952 2,731,253 Spencer Jan. 17, 1956 2,966,344 Ball Dec. 27, 1960 

